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\node (a) at (-2.5, 2.5) {a};
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\node (b) at (2.5, 2.5) {b};
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\node (c) at (-2.5, -2.5) {c};
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\node (d) at (2.5, -2.5) {d};
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\node (w) at (-1, 1) {w};
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\node (x) at (1, 1) {x};
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\node (y) at (-1, -1) {y};
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\node (z) at (1, -1) {z};
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\draw[->] (a) -- node[midway] {f} (b);
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\draw[->] (b) -- node[midway,right] {q} (d);
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\draw[->] (a) -- node[midway,left] {p} (c);
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\draw[->] (c) -- node[midway,below] {g} (d);
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\draw[->] (w) -- node[midway,below] {h} (x);
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\draw[->] (x) -- node[midway,left] {j} (z);
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\draw[->] (y) -- node[midway,above] {k} (z);
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\draw[->] (w) -- node[midway,right] {l} (y);
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\draw[->] (a) -- node[midway] {$\upsilon$} (w);
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\draw[->] (b) -- node[midway] {$\phi$} (x);
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\draw[->] (c) -- node[midway] {$\chi$} (y);
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\draw[->] (d) -- node[midway] {$\psi$} (z);
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\node (wxyz) at (0, 0) {$\kappa$};
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\node (awyc) at (-1.8, 0) {$\lambda$};
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\node (awxb) at (0, 1.8) {$\mu$};
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\node (bxzd) at (1.8, 0) {$\nu$};
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\node (cyzd) at (0, -1.8) {$\xi$};
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